Yes. Acrylic dries impervious to water, and gouache remains water-soluble, so you should be able to dissolve the gouache with water without affecting the acrylic. However, if the gouache was applied before the acrylic was completely dry, there may have been some mixing or staining that is not reversible. Some pigments tend to stain the surface more than others (phthalo blues and greens for example). Test on a small area.
Bridget Riley uses acrylics and oil paints, gouache and screenprint.
Believe it or not, the best brushes for acrylic painting are also the least expensive. The synthetic brushes with the white fibers work beautifully and degrade much more slowly than those made with natural bristle or hair. Sable and horse hair are terrific for oils or gouache, but in the case of acrylics, pair synthetic with synthetic.
Yes, you can paint over acrylic paint with gouache, as gouache is water-based and can adhere to acrylic surfaces. However, for the best results, ensure that the acrylic paint is fully dry before applying gouache. Keep in mind that gouache is more opaque and may not adhere as well to glossy finishes, so consider using a matte medium or a light sanding on the acrylic surface if needed.
Gouache
In interior or exterior house paints.... Acrylics, emulsions and latex are, oils, lacquers and shellacs are not. In artists' paints... acrylic, watercolour, gouache, and some water based airbrush paints are, oils are not..
Gouache can be used on canvas or paper, although I would say most artists use it on paper. Gouache and watercolors and acrylics are very similar; the primary difference between gouache and watercolors are that gouache paints are opaque and most watercolors are tansparent / translucent. This is not entirely accurate, however, because highly-diluted gouache paints are translucent as well.
Water colors and acrylics are both paints that are harder to mix.The consistency is alot alike.If you notice,oils really mix well because it is thicker. water color and acrylics also dry more quickly rather than oils.In reality oils takes up to one year to really be considered dry!Water colors dry within minutes and acrylics make take up to an hour depending how thick your paint layers is.Water color and acrylics are also cheaper than oils. Acrylic can be used thick without mixing with water at all, like oil, or it can be thinned with water a great deal, like watercolor. It's very versatile and dries quickly. ..................................................... I really don't see any similarity between watercolour and acrylic, for me watercolour is a very fine and beautiful material whereas acrylic is merely plastic in paint form. Maybe if you really water acrylic down you can get a worthwhile result but I've always found any acrylic painting that is OK would be a hundred times better if painted in oil or watercolour. the closest thing to acrylic that works nicely is gouache paint.
No, I think not. Use acrylics, as the gum in the gouache tends to leave oils tacky if you live in a moist climate or near the sea, especially any impasto-type technique.
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Using a gouache underpainting in a watercolor painting can provide benefits such as enhancing color vibrancy, creating a more opaque base for layering, and allowing for easier corrections and adjustments during the painting process.
Liquid acrylics, sometimes mixed with gouache. Read all about it on http://www.robertbateman.ca/art/rbop/rbatemanonpainting.html
According to Wikipedia, the word "gouache" is defined as a form of colored paint which contains a special binding agent which enables it to be used in opaque painting forms.